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Finding the Fourth Proportional to 18,621.79, 25,690.80 and 10,659.76

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Solution

The fourth proportional to 18,621.79, 25,690.80 and 10,659.76 is: 14,706.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,621.79 : 25,690.80 = 10,659.76 : x
  2. Step 2: Convert to fraction form
    18,621.79/25,690.80 = 10,659.76/x
  3. Step 3: Cross multiply
    18,621.79x = 25,690.80 × 10,659.76
  4. Step 4: Simplify right side
    18,621.79x = 273,857,762.21
  5. Step 5: Solve for x
    x = 273,857,762.21/18,621.79
  6. Step 6: Final answer
    x = 14,706.31

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.